Registration Dossier
Registration Dossier
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EC number: 617-694-1 | CAS number: 85261-19-4
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
(1) 0.30 ± 0.05 g/L at 20°C; water solubility determined as critical micelle concentration; key study
(2) > 0.912 g/L at 20°C (shake flask method); disregarded study
Key value for chemical safety assessment
- Water solubility:
- 0.3 g/L
- at the temperature of:
- 20 °C
Additional information
The critical micelle concentration of the test item was determined from a plot of surface tension versus concentration of the test item in water in a well reported study according to national testing guideline DIN ISO 4311.
Surfactants show a complex solubility behaviour due to aggregation. The monomer concentration, and hence the thermodynamic activity, reaches a limiting value at the critical micelle concentration (cmc). It remains approximately constant as the total concentration is further increased. For ecotoxicological models requiring a solubility value, the critical micelle concentration is therefore the appropriate parameter describing the water solubility of surface active materials.
In a further study the water solubility was determined by the flask method (OECD 105). Due to the expectable micelle formation of the test substance in water these experiments delivered higher solubilities compared to the cmc method. As the flask method is not the appropriate method to determine water solubilities for surfactants this study has been disregarded.
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